### Build and Install bgpq4

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Standard sequence of commands to prepare, compile, and install the software from a repository.

```bash
./bootstrap
```

```bash
./configure
```

```bash
make
```

```bash
make install
```

--------------------------------

### Build bgpq4 from Source

Source: https://context7.com/bgp/bgpq4/llms.txt

Compile bgpq4 from its source repository using autotools. This process involves cloning the repository, bootstrapping, configuring, compiling, and optionally installing the tool.

```bash
# Clone and prepare build system
git clone https://github.com/bgp/bgpq4.git
cd bgpq4
./bootstrap
```

```bash
# Configure and compile
./configure
make
```

```bash
# Install system-wide
sudo make install
```

```bash
# Create distribution archive
make dist
```

```bash
# Clean build files
make maintainer-clean
```

--------------------------------

### Execute bgpq4 in Docker

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Run the bgpq4 container image to generate prefix lists without local installation.

```bash
docker run --rm ghcr.io/bgp/bgpq4:latest -Jl eltel AS20597
policy-options {
	replace:
	prefix-list eltel {
		81.9.0.0/20;
		81.9.32.0/20;
		81.9.96.0/20;
		81.222.128.0/20;
		81.222.160.0/20;
		81.222.192.0/18;
		85.249.8.0/21;
		85.249.224.0/19;
		89.112.0.0/17;
		217.170.64.0/19;
	}
	}
```

--------------------------------

### Run bgpq4 in a Docker Container

Source: https://context7.com/bgp/bgpq4/llms.txt

Execute bgpq4 within a Docker container for isolated environments without local installation. This simplifies deployment and ensures consistent execution.

```bash
# Pull and run the container
docker run --rm ghcr.io/bgp/bgpq4:latest -Jl eltel AS20597
```

```bash
# Run with aggregation
docker run --rm ghcr.io/bgp/bgpq4:latest -Al customers AS-CUSTOMERS
```

```bash
# Generate JSON output
docker run --rm ghcr.io/bgp/bgpq4:latest -jl prefixes AS65000
```

--------------------------------

### Generate Nokia SR OS format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create configurations for Nokia SR OS in various CLI formats.

```bash
bgpq4 -Nl eltel AS20597
```

```bash
bgpq4 -nl eltel AS20597
```

```bash
bgpq4 -n2l eltel AS20597
```

```bash
bgpq4 -NEl eltel AS20597
```

--------------------------------

### Generate Huawei format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-lists and AS-path filters for Huawei devices.

```bash
bgpq4 -Ul eltel AS20597
```

```bash
bgpq4 -ul eltel AS20597
```

```bash
bgpq4 -UG 65000 AS-EXAMPLE
```

--------------------------------

### Aggregate Prefix-Lists

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -A flag to produce more compact configurations by combining adjacent prefixes.

```bash
# Generate aggregated prefix-list
bgpq4 -Al eltel AS20597

# Output:
# no ip prefix-list eltel
# ip prefix-list eltel permit 81.9.0.0/20
# ip prefix-list eltel permit 81.9.32.0/20
# ip prefix-list eltel permit 81.9.96.0/20
# ip prefix-list eltel permit 81.222.128.0/20
# ip prefix-list eltel permit 81.222.192.0/18
# ip prefix-list eltel permit 85.249.8.0/21
# ip prefix-list eltel permit 85.249.224.0/19
# ip prefix-list eltel permit 89.112.0.0/18 ge 19 le 19
# ip prefix-list eltel permit 89.112.4.0/22
# ip prefix-list eltel permit 89.112.64.0/19
# ip prefix-list eltel permit 217.170.64.0/19 ge 20 le 20
```

--------------------------------

### Generate OpenBGPD format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-sets and AS-sets for OpenBGPD.

```bash
bgpq4 -Bl eltel AS20597
```

```bash
bgpq4 -BEl eltel AS20597
```

```bash
bgpq4 -Bt AS-ELTEL
```

```bash
bgpq4 -Ba 65000 -l eltel AS20597
```

--------------------------------

### Generate Cisco IOS Prefix-Lists

Source: https://context7.com/bgp/bgpq4/llms.txt

Create standard IPv4 prefix-lists for Cisco routers using an AS-SET or ASN.

```bash
# Generate prefix-list for AS20597
bgpq4 -l eltel AS20597

# Output:
# no ip prefix-list eltel
# ip prefix-list eltel permit 81.9.0.0/20
# ip prefix-list eltel permit 81.9.32.0/20
# ip prefix-list eltel permit 81.9.96.0/20
# ip prefix-list eltel permit 81.222.128.0/20
# ip prefix-list eltel permit 81.222.192.0/18
# ip prefix-list eltel permit 85.249.8.0/21
# ip prefix-list eltel permit 85.249.224.0/19
# ip prefix-list eltel permit 89.112.0.0/19
# ip prefix-list eltel permit 89.112.4.0/22
# ip prefix-list eltel permit 89.112.32.0/19
# ip prefix-list eltel permit 89.112.64.0/19
# ip prefix-list eltel permit 217.170.64.0/20
# ip prefix-list eltel permit 217.170.80.0/20
```

--------------------------------

### Generate AS-Path Access-Lists

Source: https://context7.com/bgp/bgpq4/llms.txt

Create BGP policy filters for AS-path matching using -f or -G flags.

```bash
# Generate input AS-path filter for AS112 via AS-SPACENET
bgpq4 -Jf 112 AS-SPACENET

# Output:
# policy-options {
# replace:
#  as-path-group NN {
#   as-path a0 "^112(112)*$";
```

--------------------------------

### Maintain Build System

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Commands for cleaning the build environment or creating a distribution archive.

```bash
make maintainer-clean
```

```bash
make dist
```

--------------------------------

### Generate Cisco AS-path filter

Source: https://context7.com/bgp/bgpq4/llms.txt

Create an AS-path filter for Cisco devices.

```bash
bgpq4 -G 65000 AS-EXAMPLE
```

--------------------------------

### Generate Juniper JunOS Prefix-Lists

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-lists and route-filters in Juniper format using the -J flag.

```bash
# Generate Juniper prefix-list
bgpq4 -Jl eltel AS20597

# Output:
# policy-options {
# replace:
#  prefix-list eltel {
#     81.9.0.0/20;
#     81.9.32.0/20;
#     81.9.96.0/20;
#     81.222.128.0/20;
#     81.222.192.0/18;
#     85.249.8.0/21;
#     85.249.224.0/19;
#     89.112.0.0/19;
#     89.112.4.0/22;
#     89.112.32.0/19;
#     89.112.64.0/19;
#     217.170.64.0/20;
#     217.170.80.0/20;
#  }
# }
```

--------------------------------

### Generate IPv6 prefix-list

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Demonstrates IPv6 support using the -6 flag.

```bash
$ bgpq4 -6l as-retn-6 AS-RETN6
no ipv6 prefix-list as-retn-6
ipv6 prefix-list as-retn-6 permit 2001:7fb:fe00::/48
ipv6 prefix-list as-retn-6 permit 2001:7fb:fe01::/48
[....]
```

--------------------------------

### Generate BIRD format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-lists and AS-paths for the BIRD routing daemon.

```bash
bgpq4 -bl eltel AS20597
```

```bash
bgpq4 -bf 112 AS-SPACENET
```

```bash
bgpq4 -bt AS-ELTEL
```

--------------------------------

### Demonstrate Source Order Sensitivity

Source: https://github.com/bgp/bgpq4/blob/main/README.md

The order of sources in the -S flag can affect the resulting prefix list output.

```bash
$ bgpq4 -S RIPE,RADB as-space
no ip prefix-list NN
ip prefix-list NN permit 195.190.32.0/19
```

```bash
$ bgpq4 -S RADB,RIPE as-space
no ip prefix-list NN
ip prefix-list NN permit 45.4.4.0/22
ip prefix-list NN permit 45.4.132.0/22
ip prefix-list NN permit 45.6.128.0/22
ip prefix-list NN permit 45.65.184.0/22
[...]
```

--------------------------------

### Generate MikroTik RouterOS format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-lists for MikroTik RouterOS v6 and v7.

```bash
bgpq4 -Kl eltel AS20597
```

```bash
bgpq4 -K7l eltel AS20597
```

--------------------------------

### Generate Cisco prefix-list with aggregation

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Uses the -A flag to aggregate prefixes into a more compact Cisco prefix-list format.

```bash
$ bgpq4 -Al eltel AS20597
no ip prefix-list eltel
ip prefix-list eltel permit 81.9.0.0/20
ip prefix-list eltel permit 81.9.32.0/20
ip prefix-list eltel permit 81.9.96.0/20
ip prefix-list eltel permit 81.222.128.0/20
ip prefix-list eltel permit 81.222.192.0/18
ip prefix-list eltel permit 85.249.8.0/21
ip prefix-list eltel permit 85.249.224.0/19
ip prefix-list eltel permit 89.112.0.0/18 ge 19 le 19
ip prefix-list eltel permit 89.112.4.0/22
ip prefix-list eltel permit 89.112.64.0/19
ip prefix-list eltel permit 217.170.64.0/19 ge 20 le 20
```

--------------------------------

### Generate Cisco IOS XR format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-sets and AS-path filters for Cisco IOS XR.

```bash
bgpq4 -Xl eltel AS20597
```

```bash
bgpq4 -XG 65000 AS-EXAMPLE
```

--------------------------------

### Generate IPv6 Prefix-Lists

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -6 flag to generate prefix-lists for IPv6 address families.

```bash
# Generate IPv6 prefix-list for AS-RETN6
bgpq4 -6l as-retn-6 AS-RETN6

# Output:
# no ipv6 prefix-list as-retn-6
# ipv6 prefix-list as-retn-6 permit 2001:7fb:fe00::/48
# ipv6 prefix-list as-retn-6 permit 2001:7fb:fe01::/48
# [...]
```

--------------------------------

### Configure Router Policy-Options

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros--6.txt

Commands to define a prefix list named NN with specific IPv6 prefixes and commit the changes.

```text
configure router policy-options
begin
no prefix-list "NN"
prefix-list "NN"
    prefix 2001:4:112::/48 exact
    prefix 2620:4f:8000::/48 exact
exit
commit
```

--------------------------------

### Tune OS Network Buffers for Performance

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Adjust TCP buffer settings to improve performance when expanding large AS-SETs.

```bash
sysctl -w net.inet.tcp.sendbuf_max=2097152
```

```bash
sysctl -w net.ipv4.tcp_window_scaling=1

sysctl -w net.core.rmem_max=2097152

sysctl -w net.core.wmem_max=2097152

sysctl -w net.ipv4.tcp_rmem="4096 87380 2097152"

sysctl -w net.ipv4.tcp_wmem="4096 65536 2097152"
```

--------------------------------

### Generate custom output formats

Source: https://context7.com/bgp/bgpq4/llms.txt

Use format specifiers to generate custom output for non-router systems.

```bash
bgpq4 -F "ipfw add pass all from %n/%l to any\n" as3254
```

```bash
bgpq4 -6F "%n/%l; " as-eltel
```

```bash
bgpq4 -F "iptables -A INPUT -s %n/%l -j ACCEPT\n" AS65000
```

--------------------------------

### Generate complex Juniper policy-options

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Uses extra match conditions, length constraints, and hierarchical naming for advanced Juniper policy generation.

```bash
$ bgpq4 -AJEl eltel/specifics -r 29 -R 32 -M "community blackhole" AS20597
policy-options {
 policy-statement eltel {
  term specifics {
replace:
   from {
    community blackhole;
    route-filter 81.9.0.0/20 prefix-length-range /29-/32;
    route-filter 81.9.32.0/20 prefix-length-range /29-/32;
    route-filter 81.9.96.0/20 prefix-length-range /29-/32;
    route-filter 81.222.128.0/20 prefix-length-range /29-/32;
    route-filter 81.222.192.0/18 prefix-length-range /29-/32;
    route-filter 85.249.8.0/21 prefix-length-range /29-/32;
    route-filter 85.249.224.0/19 prefix-length-range /29-/32;
    route-filter 89.112.0.0/17 prefix-length-range /29-/32;
    route-filter 217.170.64.0/19 prefix-length-range /29-/32;
   }
  }
 }
}
```

--------------------------------

### Generate Juniper prefix-filter

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Generates a named Juniper prefix-list for a specific AS.

```bash
$ bgpq4 -Jl eltel AS20597
policy-options {
replace:
 prefix-list eltel {
    81.9.0.0/20;
    81.9.32.0/20;
    81.9.96.0/20;
    81.222.128.0/20;
    81.222.192.0/18;
    85.249.8.0/21;
    85.249.224.0/19;
    89.112.0.0/19;
    89.112.4.0/22;
    89.112.32.0/19;
    89.112.64.0/19;
    217.170.64.0/20;
    217.170.80.0/20;
 }
}
```

--------------------------------

### Configure BGPQ4 Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros-mdcli--4.txt

Use these commands to remove an existing prefix list and define a new one with specific prefixes.

```text
/configure policy-options
delete prefix-list "NN"
prefix-list "NN" {
    prefix 192.31.196.0/24 type exact {
    }
    prefix 192.175.48.0/24 type exact {
    }
}
```

--------------------------------

### Generate Juniper Extended Route-Filters

Source: https://context7.com/bgp/bgpq4/llms.txt

Apply additional match conditions and more-specific route filtering for Juniper configurations.

```bash
# Generate route-filter with community match and more-specifics /29-/32
bgpq4 -AJEl eltel/specifics -r 29 -R 32 -M "community blackhole" AS20597

# Output:
# policy-options {
#  policy-statement eltel {
#   term specifics {
# replace:
#    from {
#     community blackhole;
#     route-filter 81.9.0.0/20 prefix-length-range /29-/32;
#     route-filter 81.9.32.0/20 prefix-length-range /29-/32;
#     route-filter 81.9.96.0/20 prefix-length-range /29-/32;
#     route-filter 81.222.128.0/20 prefix-length-range /29-/32;
#     route-filter 81.222.192.0/18 prefix-length-range /29-/32;
#     route-filter 85.249.8.0/21 prefix-length-range /29-/32;
#     route-filter 85.249.224.0/19 prefix-length-range /29-/32;
#     route-filter 89.112.0.0/17 prefix-length-range /29-/32;
#     route-filter 217.170.64.0/19 prefix-length-range /29-/32;
#    }
#   }
#  }
# }
```

--------------------------------

### Configure IPv6 Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/ios--6.txt

Clears an existing prefix list and defines new permit rules for specific IPv6 prefixes.

```text
no ipv6 prefix-list NN
ipv6 prefix-list NN permit 2001:4:112::/48
ipv6 prefix-list NN permit 2620:4f:8000::/48
```

--------------------------------

### Generate JunOS AS-path-origin filter

Source: https://context7.com/bgp/bgpq4/llms.txt

Create filters for JunOS 21.3R1+ using the -H flag.

```bash
bgpq4 -JH 112 AS-SPACENET
```

--------------------------------

### Connect to Alternate IRRD Host

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -h flag to specify an alternate IRRD host, optionally with a custom port. The default host is rr.ntt.net.

```bash
# Use alternate IRRD host
bgpq4 -h whois.radb.net AS-EXAMPLE
```

```bash
# Use alternate host with custom port
bgpq4 -h irrd.example.com:4343 AS-EXAMPLE
```

--------------------------------

### Select IRR sources

Source: https://context7.com/bgp/bgpq4/llms.txt

Limit queries to specific IRR databases or objects.

```bash
bgpq4 -S RIPE,ARIN AS-VOSTRON
```

```bash
bgpq4 -S RPKI,AFRINIC,ARIN,APNIC,LACNIC,RIPE AS-EXAMPLE
```

```bash
bgpq4 RIPE::AS-VOSTRON
```

```bash
bgpq4 -S RIPE ARIN::AS-EXAMPLE
```

--------------------------------

### Specify Authoritative Source with :: Notation

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Use the :: notation to set the data source for specific AS-SETs or Route Sets, allowing for granular control over queries.

```bash
$./bgpq4 RIPE::AS-VOSTRON
no ip prefix-list NN
ip prefix-list NN permit 89.21.224.0/19
ip prefix-list NN permit 134.0.64.0/21
ip prefix-list NN permit 208.86.232.0/22
ip prefix-list NN permit 208.86.232.0/24
ip prefix-list NN permit 208.86.233.0/24
ip prefix-list NN permit 208.86.234.0/24
ip prefix-list NN permit 208.86.235.0/24
```

--------------------------------

### Configure IPv6 Prefix

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/huawei--6.txt

Use this command to permit specific IPv6 prefixes within a routing policy. Ensure the prefix and mask are correctly specified.

```network-configuration
undo ip ipv6-prefix NN
ip ipv6-prefix NN permit 2001:4:112:: 48
ip ipv6-prefix NN permit 2620:4f:8000:: 48
```

--------------------------------

### Configure BGP Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros--4.txt

Use this configuration to define a BGP prefix list named 'NN'. This involves removing any existing 'NN' prefix list and then creating a new one with specific IP address prefixes and exact match criteria.

```junos
configure router policy-options
begin
no prefix-list "NN"
prefix-list "NN"
    prefix 192.31.196.0/24 exact
    prefix 192.175.48.0/24 exact
exit
commit
```

--------------------------------

### Generate Arista EOS format

Source: https://context7.com/bgp/bgpq4/llms.txt

Create prefix-lists for Arista EOS with automatic sequence numbers.

```bash
bgpq4 -el eltel AS20597
```

--------------------------------

### Generate JSON output

Source: https://context7.com/bgp/bgpq4/llms.txt

Produce JSON-formatted output for automation integration.

```bash
bgpq4 -jl example AS20597
```

```bash
bgpq4 -jf 20597 AS-ELTEL
```

```bash
bgpq4 -jt AS-EXAMPLE
```

--------------------------------

### Configure IPv6 Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/eos--6.txt

Defines an IPv6 prefix list with specific sequence numbers for permit rules.

```text
no ipv6 prefix-list NN
ipv6 prefix-list NN
   seq 1 permit 2001:4:112::/48
   seq 2 permit 2620:4f:8000::/48
```

--------------------------------

### Generate custom user-defined output

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Uses the -F flag to define a custom output format string for non-router systems.

```bash
$ bgpq4 -F "ipfw add pass all from %n/%l to any\n" as3254
ipfw add pass all from 62.244.0.0/18 to any
ipfw add pass all from 91.219.29.0/24 to any
ipfw add pass all from 91.219.30.0/24 to any
ipfw add pass all from 193.193.192.0/19 to any
```

```bash
$ bgpq4 -6F "%n/%l; " as-eltel
2001:1b00::/32; 2620:4f:8000::/48; 2a04:bac0::/29; 2a05:3a80::/48;
```

--------------------------------

### Generate JunOS Route-Filter-Lists

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -z flag to generate route-filter-lists for JunOS 16.2+. The -J flag specifically targets JunOS output.

```bash
# Generate route-filter-list
bgpq4 -Jzl eltel AS20597
```

```text
# Output:
# policy-options {
# replace:
#  route-filter-list eltel {
#     81.9.0.0/20 exact;
#     81.9.32.0/20 exact;
#     [...]
#  }
# }

```

```bash
# With aggregation
bgpq4 -AJzl eltel AS20597
```

--------------------------------

### Generate 32-bit ASN path-group

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Generates an as-path-group supporting 32-bit ASNs.

```bash
$ bgpq4 -Jf 112 AS-SPACENET
policy-options {
replace:
 as-path-group NN {
  as-path a0 "^112(112)*$";
  as-path a1 "^112(.)*(1898|5539|8495|8763|8878|12136|12931|15909)$";
  as-path a2 "^112(.)*(21358|23456|23600|24151|25152|31529|34127|34906)$";
  as-path a3 "^112(.)*(35052|41720|43628|44450|196611)$";
 }
}
```

--------------------------------

### Define a Prefix Set in Routing Policy

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/srlinux--4.txt

Use this syntax to define a new prefix set named 'NN' with specific IP address prefixes and mask length ranges. Ensure correct formatting for prefixes and mask length specifications.

```routing-policy
prefix-set "NN" {
    prefix 192.31.196.0/24 mask-length-range exact { }
    prefix 192.175.48.0/24 mask-length-range exact { }
}
```

--------------------------------

### Configure BGPQ4 AS Path Group

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros-mdcli--asp.txt

Defines an AS path group named NN with a specific regular expression entry.

```text
/configure policy-options
delete as-path-group "NN"
as-path-group "NN" {
  entry 1 {
    expression "112+"
  }
}
```

--------------------------------

### Configure BGP AS-path group

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros--asp.txt

Defines an AS-path group named NN with a specific regular expression entry.

```text
configure router policy-options
begin
no as-path-group "NN"
as-path-group "NN"
  entry 1 expression "112+"
exit
commit
```

--------------------------------

### Update Test Reference Data

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Execute the generation script to update known-good reference data after modifying bgpq4 output.

```bash
./tests/generate_outputs.sh ./bgpq4 tests/reference
```

--------------------------------

### Configure BGP Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros-mdcli--6.txt

Defines a prefix list named 'NN' for BGP policy configuration. This includes IPv6 prefixes with an exact match type.

```junos
prefix-list "NN" {
    prefix 2001:4:112::/48 type exact {
    }
    prefix 2620:4f:8000::/48 type exact {
    }
}
```

--------------------------------

### Limit IRR Data Sources with -S Flag

Source: https://github.com/bgp/bgpq4/blob/main/README.md

Use the -S flag to restrict queries to specific databases. Ensure all required sources for the AS-SET are included.

```bash
$./bgpq4 -S RIPE AS-VOSTRON
no ip prefix-list NN
ip prefix-list NN permit 89.21.224.0/19
ip prefix-list NN permit 134.0.64.0/21
```

```bash
$./bgpq4 -S RIPE,ARIN AS-VOSTRON
no ip prefix-list NN
ip prefix-list NN permit 89.21.224.0/19
ip prefix-list NN permit 134.0.64.0/21
ip prefix-list NN permit 208.86.232.0/24
ip prefix-list NN permit 208.86.233.0/24
ip prefix-list NN permit 208.86.234.0/24
ip prefix-list NN permit 208.86.235.0/24
```

--------------------------------

### Generate Cisco/Arista Prefix-Lists with Sequence Numbers

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -s flag to add sequence numbers to Cisco IOS and Arista EOS prefix-lists. This is essential for managing and updating prefix-lists on these platforms.

```bash
# Generate prefix-list with sequence numbers
bgpq4 -sl eltel AS20597
```

```text
# Output:
# no ip prefix-list eltel
# ip prefix-list eltel seq 1 permit 81.9.0.0/20
# ip prefix-list eltel seq 2 permit 81.9.32.0/20
# ip prefix-list eltel seq 3 permit 81.9.96.0/20
# [...]
```

--------------------------------

### Add BGP Routing Filter Rule

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/routeros7--4.txt

Use this command to add a new routing filter rule to a specified chain. The rule accepts traffic if the destination matches the given IP address range.

```bash
/routing filter rule add chain="NN-V4" rule="if (dst==192.31.196.0/24) {accept}"
```

```bash
/routing filter rule add chain="NN-V4" rule="if (dst==192.175.48.0/24) {accept}"
```

--------------------------------

### Limit Maximum Prefix Length

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -m flag to limit the maximum prefix length for accepted prefixes. This is useful for controlling the granularity of your routing policies.

```bash
# Accept only prefixes up to /24 for IPv4
bgpq4 -m 24 -l customers AS-CUSTOMERS
```

```bash
# Accept only prefixes up to /48 for IPv6
bgpq4 -6 -m 48 -l customers6 AS-CUSTOMERS
```

--------------------------------

### Exclude Objects from Expansion

Source: https://context7.com/bgp/bgpq4/llms.txt

Append EXCEPT followed by the objects to exclude to prevent their expansion. This is useful for fine-tuning the generated filters.

```bash
# Generate prefix-list excluding specific AS-SET
bgpq4 -l customers AS-CUSTOMERS EXCEPT AS-EXCLUDED
```

```bash
# Exclude multiple objects
bgpq4 -l peers AS-PEERS EXCEPT AS64496 AS-PRIVATE AS-BOGONS
```

--------------------------------

### Add IPv6 Routing Filter Rule for 2620:4f:8000::/48

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/routeros7--6.txt

Adds a routing filter rule to the 'NN-V6' chain. This rule accepts traffic destined for the 2620:4f:8000::/48 network. This command is useful for implementing specific network access policies.

```bash
/routing filter rule add chain="NN-V6" rule="if (dst==2620:4f:8000::/48) {accept}"
```

--------------------------------

### Add IPv6 Routing Filter Rule for 2001:4:112::/48

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/routeros7--6.txt

Adds a routing filter rule to the 'NN-V6' chain. This rule accepts traffic destined for the 2001:4:112::/48 network. Ensure the 'routing filter rule add' command is available in your environment.

```bash
/routing filter rule add chain="NN-V6" rule="if (dst==2001:4:112::/48) {accept}"
```

--------------------------------

### Configure BGP Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/eos--4.txt

Defines a BGP prefix list named 'NN' with specific network entries. Use this to filter BGP routes based on IP prefixes.

```network-config
no ip prefix-list NN
ip prefix-list NN
   seq 1 permit 192.31.196.0/24
   seq 2 permit 192.175.48.0/24
```

--------------------------------

### Add BGP Routing Filter Rules

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/routeros6--4.txt

Defines filter rules to accept specific IPv4 prefixes in the NN-V4 chain.

```RouterOS
/routing filter add action=accept chain="NN-V4" prefix=192.31.196.0/24
/routing filter add action=accept chain="NN-V4" prefix=192.175.48.0/24
```

--------------------------------

### Limit Recursion Depth

Source: https://context7.com/bgp/bgpq4/llms.txt

Use the -L flag to limit the AS-SET expansion recursion depth. This prevents excessive queries on deeply nested AS-SETs and helps manage resource usage.

```bash
# Limit recursion to 2 levels
bgpq4 -L 2 AS-LARGESET
```

```bash
# Limit recursion to 5 levels
bgpq4 -L 5 -l limited AS-VERYLARGESET
```

--------------------------------

### Delete BGP Prefix List

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/sros-mdcli--6.txt

Command to delete an existing prefix list named 'NN' within BGP policy options.

```junos
delete prefix-list "NN"
```

--------------------------------

### Delete a Prefix Set in Routing Policy

Source: https://github.com/bgp/bgpq4/blob/main/tests/reference/srlinux--4.txt

Command to remove an existing prefix set named 'NN' from the routing policy configuration. This action is irreversible.

```routing-policy
delete prefix-set "NN"
```

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